661079 has 8 divisors (see below), whose sum is σ = 719568. Its totient is φ = 604800.

The previous prime is 661061. The next prime is 661091. The reversal of 661079 is 970166.

It is a happy number.

661079 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (89946).

2⁶⁶¹⁰⁷⁹ is an apocalyptic number.

661079 is a deficient number, since it is larger than the sum of its proper divisors (58489).

661079 is a wasteful number, since it uses less digits than its factorization.

661079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 661079 is about 813.0676478621. The cubic root of 661079 is about 87.1132975849.

The spelling of 661079 in words is "six hundred sixty-one thousand, seventy-nine".